Cast-off



Patented May 14, 1929.

; UNITED'STATES PATEN OFF!(3E.-.'

WILLIAIIM; DUANE, 0E BEVERLY, MASSACHUSETTS, ASSIGNOR TO UNITED SHOE MA- CHINERY CORPORATIONyOF PATERSON. NE'W JERSEY, A CORPORATION OF HEXV JERSEY.

cAs'r-orr.

Application filed February 15, 1927. Serial Ito/168,263.

- The invention relates to cast-offs and more specifically contemplates the provision of an im tiroved clamping device for holding the cast-off 'adjustably in engagement with the needle. 9 V

The object of theinvention is to provide a novel and improved clamping device for holding the'cast-oif in engagen'ient withthe needle which may be readily adjusted to obtain a proper contact of the cast-oil. with the needle. I

With this object in view the features of the invention consist in the devices, combinations and arrangement of parts hereinafter described and claimed and together with the advantages obtained thereby will be readily understood by those skilled in the art from the following description, taken in connection with the accompanying drawing, in which Fig. 1 is a sectional view in side elevation of a straight hook needlewith the needle bar and cast-off; Fig. 2 is a view of the cast-off clamp with the inclination of the clamping surface exaggerated for purposes of illustration; and Fig. 3 isa sectional view taken on the line 33 of Fig. 1.

The invention is herein disclosed as embodied in a straight hook needle sewing ma-- chine and is particularly adapted for use 1n chain stitch shoe sewing machines of the McKay type, although it isnot limited thereto. Only so much of the machine is disclosed as is necessary to show the connection of the present invention therewith.

Difliculty has been experienced in clamping the cast-ofi' with relation to the needle so as to hold the cast-oil at all times properly in engagement with the needle, due to imperfections or bending of the parts, the

tendency being either for the cast-off to bear too heavily against the needle with a consequent friction and wear of the parts or to be out of contact with the needle entirely re sulting in uncertain or faulty operation of the machine.

The preferred form of the invention comprises a clamping device for the cast-oil slight inclination to a right angle with its axis sothat by turning the bushing the end of the cast-off is moved to or from the needle to secure the desired adjustment.

Referring to the drawings an ordinary straight hook needle is indicated at 4 mounted in the lower end of a needle bar 6 which is arranged to reciprocate in a vertical plane in a chain-stitch shoe sewing machine of the McKay type. at 8 is adapted to slide in a groove 10 in the needle bar, and is connected at its upper end to a holder consisting of a collar 12 slidably mounted. on the needle bar 6. The connections between the cast-off and the collar 12 comprise a bushing 14, with a knurled head 16, mounted to turn in a bearing formed in the collar 12. at right angles to the needle bar, the inner end of the bushing extending slightly within the inner face of.

the collar. A bolt 20 is loosely fitted within the bushing. At its inner end the bolt is bored to receive the cast-off and is provided at the outer end with a nut 22 to tighten the bolt and so to clamp the cast-oif against a clamping surface or face formed at the inner end of the bushing. A groove 24: is cut in the needle'bar to receive the head of the bolt 20 and allow a freedomof movement to the collar 12 along the needle bar.

In order to'permit adjustment of the castoif to and from the needle to be made readily and accurately, the clan'iping face at the inner end of the bushing is formed at a slight inclination to a right angle with the axis of the bushing so that it can be set at varying degrees of inclination to the axis of the needle bar. By loosening the bolt, turning the bushing in one direction or the other and again tightening the bolt, the end of the The cast-oif indicated cast-0d in contact with the'needle can be with a straight hook needle and needle bar of a cast-oil, a holder to which the cast-off isconnected-mounted on the needle bar to slide longitudinally of the needle bar, and

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means for adjusting the cast-off in the holdor to vary the pressure with which it bears against the needle.

2. In a sewing machine thecombination with a straight hook needle and needle bar of a cast-oil, a collar to which the cast-oft is connected mounted on the needle bar to slide longitudinally of the needle bar, and means for adjusting the east-elf to vary the pressure with which it bears against the needle.

in a sewing machine the combination with a straight hook needle and a needle be: provided with a groove of the cast-elf mount-- ed to slide in the groove in the needle bar, a collar slidably mounted on the needle bar, a bushing mounted in the collar provided at its end with a claniping surface inclined to the axis oi? the bushing, and a bolt for clamping the cast-off against said clamping surface. i

4t. In a sewing machine the combination with a straight hook needle and needle bar of a east-oft, a holder to which the cast-oil is connected mounted to reciprocate longitudin all y of the needle bar, a bushing mounted in the holder provided at its end with a clamping surface inclined to the axis of the bushing and a bolt for'clainping the cast-ofl' against said clamping surface.

5. In a sewing'machine the combination with a straight hook needle and a needle bar proviified with a groove of a cast-off 1nounted to slide in the groove in the needle bar, a collar slidably mounted on the needle bar, a bushing mounted in the collar provided at its inner end with a clamping surface set at :1 slight inclination to a right angle with its axis for adjusting the castofl" relatively to the needle, a bolt throughwhich the castofi' passes for clamping the cast-off to the bushing, and means for tightening the bolt to clamp the cast-off to the bushing. V

In testimony whereof I have signed my name to this specification;

WILLIAM DUANE. 

